⌘ K
png · jpg · quality · local

Convert PNG to JPG in your browser

Re-encode PNGs as JPEGs with quality control and a custom background color for transparent pixels. Everything runs locally.

PNG to JPG
Source
—
no file
Output
—
—
Quality
92%
jpeg
Saved
—
ratio
Quality:92%
BG:
input · image

image/png · runs locally · nothing uploaded

output · preview
Preview appears here
Quick Start

How it works

Pick an image, tune the options, then download the result. Everything runs in your browser.

  1. 01

    Pick a PNG

    Drop a PNG into the picker or browse for one. The file is read by FileReader and decoded into an HTMLImageElement entirely client-side — nothing leaves your device.

    Both 8-bit and 16-bit PNGs are accepted, with or without an alpha channel. Multi-megapixel masters work fine; the only ceiling is your tab’s memory.

    PNGFileReaderHTMLImageElementprivacy-first
    input · pngloaded
    file.png · alpha
1920 × 1080 · 8-bit
    decodedready
  2. 02

    Pick a background

    JPEG has no alpha channel — every transparent pixel must be flattened onto a solid colour. The tool calls ctx.fillStyle = bg; ctx.fillRect(0, 0, w, h) before ctx.drawImage so the result is deterministic.

    White (#ffffff) suits product photos; pick a brand colour for logos, or pre-match the page background for seamless inline use.

    alpha → backgroundcanvasfillRectflatten
    config · bg#ffffff
    ctx.fillStyle = bg;
ctx.fillRect(0,0,w,h);
ctx.drawImage(img,0,0);
    flattenedno alpha
  3. 03

    Tune JPEG quality

    The quality slider feeds the second argument of canvas.toBlob("image/jpeg", q). Values run 0 to 1 — lower = smaller file, more blocking artefacts. The 0.80–0.92 band is the sweet spot for photographic content.

    Drop below 0.70 only when you genuinely need the bytes; you’ll start to see 8×8 DCT-block ringing around hard edges.

    toBlobJPEG quality 0-1DCTphotographic
    config · quality92%
    canvas.toBlob(
  "image/jpeg",
  0.92
)
    encodedlive
  4. 04

    Download JPG

    Save the JPEG with a one-click download. The stats bar shows the Saved % ratio against the source so you can verify your quality choice before shipping.

    Encoding happens locally — nothing is uploaded, and the original PNG on disk is never touched.

    download.jpgsize ratioprivacy-first
    export · jpgready
    ✓ Downloaded: file.jpg
✓ Saved 67% on size
✓ 100% client-side
    ready to shipsuccess
Pro tips

Browser-only image work that scales

Convert with quality control

JPEG/WebP let you pick a 0–1 quality. Default 0.92 is a good compromise of size and visible quality.

PNG isn’t free

Use PNG only for transparency or sharp edges. For photos, WebP is smaller at the same perceived quality.

Strip EXIF for privacy

Photo EXIF often contains GPS, camera model, and timestamps. Strip before sharing public uploads.

Watch the colour profile

Convert to sRGB before web export. Wide-gamut images render oversaturated in non-managed browsers.

AVIF when it’s available

AVIF beats WebP on size at the same quality. Detect support via <picture> with fallbacks.

Lazy-load below the fold

Add loading="lazy" on <img>. The browser handles scheduling — no IntersectionObserver needed.

Related toolsJPG to PNGPNG to WebPImage CompressorWebP ConverterCompress to TargetImage Resizer
Use Cases

When to use this tool

Common workflows it speeds up.

Shrink large PNGs

Photos saved as PNG are huge — JPEG cuts size 5–10×. Decoded into a Canvas 2D context — original bytes never leave the tab, so you can process customer-uploaded photos, internal screenshots, or sensitive diagrams without privacy concerns.

px-perfect

Email-safe attachments

Below typical email size limits. Encoders expose quality 0–1 where the format supports it (JPEG, WebP); PNG and AVIF stay perceptually lossless. Pick 0.85 for web, 0.95 for archival, 0.7 for thumbnails.

quality-tunable

Web-ready photos

Cheaper to serve over HTTP than PNG. Pair with the EXIF Stripper before sharing user-uploaded photos publicly. Camera serial numbers, GPS coordinates, and timestamps often hide in image metadata and leak more than the picture itself.

format-aware

Bulk legacy export

Convert PNG dumps from screenshots. Output preserves colour profile (sRGB) so it renders consistently across browsers, monitors, and print pipelines. Wide-gamut workflows can opt into Display P3 for modern Apple devices.

EXIF-safe

Print prep

Most print services prefer JPEG. Re-runs only on option changes, never on window resize, so the canvas stays responsive on large images. drawImage uses the browser's bilinear filter for fast resampling.

client-side

Storage trim

Cut archives down without losing photos. Downloads as .png, .jpg, .webp, or .avif with the correct MIME so editors apply native handling on save. The filename inherits a sensible suffix derived from the input.

compression-ready
FAQ

Frequently asked questions

No. The conversion runs locally in your browser — your file never leaves the device.
92% is the default and looks identical to the source for most photos. Below 70% you'll see compression artifacts.
JPEG has no alpha channel. The background-color picker fills transparency before encoding.
No. The tool only reads the file and creates a new JPEG. Your PNG stays untouched.
Limited only by your device's memory. Multi-megapixel photos work fine.
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